CVE-2022-36197 in BigTree
Summary
by MITRE • 08/03/2022
BigTree CMS 4.4.16 was discovered to contain an arbitrary file upload vulnerability which allows attackers to execute arbitrary code via a crafted PDF file.
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Analysis
by VulDB Data Team • 08/30/2022
The CVE-2022-36197 vulnerability represents a critical arbitrary file upload flaw in BigTree CMS version 4.4.16 that fundamentally compromises the security posture of affected systems. This vulnerability stems from insufficient input validation and sanitization mechanisms within the CMS's file upload functionality, specifically when processing PDF documents. The flaw enables remote attackers to bypass security controls and upload malicious files that can subsequently be executed on the target server, creating a severe attack surface that can be exploited for various malicious activities including remote code execution and persistent access.
The technical implementation of this vulnerability occurs through the CMS's handling of file uploads where the application fails to properly validate file extensions, content types, or file signatures before processing submissions. Attackers can craft specially designed PDF files that contain embedded malicious code or exploit the upload mechanism to place web shells or other malicious executables within the web root directory. This weakness aligns with CWE-434 which describes improper restriction of uploads of executable files, and represents a classic example of insecure file upload vulnerabilities that have been consistently exploited in content management systems and web applications. The vulnerability operates at the application layer and can be triggered through standard HTTP POST requests to the CMS's file upload endpoints.
The operational impact of CVE-2022-36197 is severe and multifaceted, potentially allowing attackers to achieve full system compromise and persistent access to affected environments. Once exploited, the vulnerability can enable attackers to execute arbitrary commands on the server, establish backdoors, steal sensitive data, perform lateral movement within networks, and maintain unauthorized access for extended periods. The attack can be conducted remotely without requiring authentication, making it particularly dangerous for organizations that have not implemented proper network segmentation or monitoring controls. This vulnerability directly maps to several tactics in the MITRE ATT&CK framework including T1190 for Exploit Public-Facing Application, T1059 for Command and Scripting Interpreter, and T1078 for Valid Accounts, as attackers can leverage compromised systems to further their objectives within target environments.
Organizations affected by this vulnerability should immediately implement multiple layers of mitigation strategies to protect their systems. The primary recommendation involves applying the vendor-provided security patches and updates as soon as they become available, which typically address the root cause by implementing proper file validation mechanisms and content type checking. Network-level protections should include implementing strict file type restrictions at the firewall or web application firewall level, blocking uploads of potentially dangerous file extensions, and monitoring for suspicious upload activities. Additionally, system administrators should conduct thorough security assessments including vulnerability scanning, penetration testing, and code review to identify any potential exploitation attempts. The remediation process should also involve implementing proper file upload validation controls such as MIME type checking, file signature verification, and ensuring that uploaded files are stored outside the web root directory to prevent direct execution. Organizations should also consider implementing automated monitoring solutions that can detect anomalous file upload patterns and trigger security alerts when suspicious activities are observed.